Html:
<div class="go-to-top text-center">
    <a>
        <span class="glyphicon glyphicon-arrow-up"></span>
    </a>
</div>
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Css:
.go-to-top {
    position: fixed;
    bottom: 8px;
    right: 15px;
    height: 38px;
    width: 38px;
    border: 2px #999999 solid;
    border-radius: 50%;
    line-height: 38px;
    z-index: 10;
    cursor: pointer;
}
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JQuery:
$(".go-to-top").click(function () {
    $("html,body").animate({ scrollTop: 0 }, "slow");
});